I go up to the loft every November and put down poison and spend all winter feling guilty about it, but if I don't we don't get any sleep. Our mice have hobnailed boots.
My sister though - she could see the rats running along her pergola and eating her grapes then running under her roof tiles. She read that if she mixed peanut butter with plaster of paris and rolled it into balls the rats would eat it and.... well, I shall leave it to your imagination. Not pleasant and I couldn't do it.
So she went into the chemists and asked for some plaster of paris, and was asked why she wanted it. She told the assistant, who looked horrified and went to fetch the chemist. He was furious and refused to sell it to her! He threatened to report her for cruelty to animals. I asked what she did next.
She went to another one, was asked again, and said she wanted to make ornaments from moulds!
Since when did plaster of paris become such a dangerous item to buy that chemists ask why you want it?